Signaling apparatus and circuit therefor.



:Patented Aug.. |4,' |900.

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A. sTnoMBEne lA. A. cAnLsoN. SIGNALING APPARATUS AND CIRCUIT THEBEFDB.

(Application filed Ap (No Model.)

Nrrnn STATES PATENT kOrr-ron.

ALFRED STROMBERG AND ANDROV CARLSON, OF CHICAGO, ILLINOIS, ASSIGNORS TOTHE STROMBERGCARLSON TELEPHONE MANUFAC- TURING COMPANY, OF SAME PLACE.

SIGNALING APPARATUS AND ClRCUljT THEREFOR.

SPECIFICATION Vforming par'.- of Letters Patent No. 655,809, datedAugust 14., 190e.

Application sled April 26, 1899.

To all whom it may concern:

Be it known that we', ALFRED STROMBERG and ANDRov CARLSON, citizens ofthe United States, residing at Chicago, in the county of Cook and Stateof Illinois, have invented a certain new and useful Improvement inSignaling Apparatus and Circuits Therefor, (Case No. 1,) of which thefollowing is a full, clear,b

concise, and exact description, reference be-A ing had to theaccompanying drawings, form-L lines and another object the improvementin` the construction of magneto-generators to increase the efficiencythereof.

One feature of our invention may be generally described as consisting ofa magnetof generator, a magneto-bell, and a switch auf tomaticallycontrolled by the operation of the generator for including Vthe armatureof the generator in circuit with the bell when signals are to betransmitted from a substation and to exclude the armature of thegenerator from circuit with the saidbell by opening the circuit throughthe armature when the substation apparatus is to be placed in conditionto receive signals. By this means we are enabled to accomplishautomatically what was heretofore accomplished by manual means, whichare extremely objectionable, especially in telephone practice.

In the preferred embodiment of the invention we preferably employ nasthe circuitchanging portion a strip of spring metal pro vided with ahole through which the crankshaft of the generator passes normallyWithout making electrical connection withjthe said spring. By means ofthe cam the shaft is moved axially, when rotated, to bring anenlargement thereof in contact with the spring to close thegeneratorfcircuit. When the shaft is relieved of rotary effort, thespring serial No. 714,534. (N man.)

Figure l of the drawings illustrates a telephone-substation connectedwith apparatus at a central exchange. Fig. 2 is an elevation, partiallyin section, of a magneto-generator constructedin accordance with ourinvention. Fig. 3 is an end` View of the generator shown inFig. 2, thehandle being removed clearly to show parts concealed thereby. Fig. et isa view in cross-section ofthe armature-core of the magneto-generator.Fig. 5 is an end View of the armature-core. showing the cam mechanismfor shifting the crank shaft or axle of the generator longitudinally.` z

Like characters of reference indicate like parts throughout thedifferent figures.

In the drawings we have shown one wellknown type of telephone-substationapparatus 'that may be employed in connection with our invention-namely,a well-known form of telephone spring-switch hook a, the receiver b, thetransmitter c, and the magneto call-bell d, the receiver when in placeupon its hook serving toclose circuit through the call-bell and whenremoved from its hook serving to open circuit through the call-bell andinclude the telephonie apparatus in circuit with the telephone-line l 2,extending to the exchange and connected thereat with a Well-known formof spring-jack whose linesprings c f are normally engagedwith backcontact-terminals of an indicator ,or drop g. The signaling-conductor 8,terminating in the normal contact of the telephone switch* hook, isprovided with a branchconnection, in the embodiment shown at the point4, this branch connection 5 including the armature 6 of the generator,the metallic framework of Fig. 6 is anend view.`

the generator including the journals Zt of the crank-shaft and theenlargement 7L upon the said crank-shaft in electrical connection withthe said journals. The signaling-conductor 3 includes thecircuit-changing spring t and the bell CZ when the generator is idle.The shaft of the generator passes through an aperture of a greaterdiameter, whereby the circuit-changing portion is normally maintainedout of connection with the branch 5.

When the crank-shaft of the generator is rotated, a pin t', carried uponone end thereof, rides upon the walls of a V-shaped groove provided inthe hub of the gear-wheel Zt, the said shaft thus being'moved axially7against the force of a coiled spring Z. The enlargement Zt' is thusbrought into contact with the circuit-changing spring t', which is thusautomatically shifted from engagement with its normal contact m, whichserves normally to complete the continuity of the conductor 3 inengagement with itsalternate Contact h', the portion fm, of theconductor 3 thus being re- -placed by the branch generator-conductor 5,including the armature-coil of the generator, the framework thereof, theshaft, and its enlargement.

lt will be seen that we provide a signalingconductor which is normallycomposed in part of a conducting portion of low resistance serving tocomplete circuit through the magneto-bell, which portion of lowresistance is replaced by the branch including the generator-coil, whichis of high resistance, when it is desired to transmit signaling-currentover the line, the generator-coil being normally in open circuit.

We will now describe the operation of the signal-receiving devicesillustrated in Fig. l. When it is desired to ring the magneto-bell d,the plug n is inserted, whose contact members are engaged with thesprings e and f. By pressing the ringing key o the generator p isincluded in circuit with the signal-bell through the conductor 3 and thelow-resistance portion m of the said conductor. If it should be desiredto operate the indicator g, the plug n being withdrawn from its socket,the crank-shaft of the generator is rotated to separate thecircuit-changing spring Z from its normal con tact m, whereby thelow-resistance portion m of the conductor 3 is replaced by the armature6 of thegenerator and its contact, which are thus included in seriesbetween the normal contact of the telephone-hook and the magneto-bellOZ. The generator is preferably constructed as `illustrated in Figs. 2,3, 4, 5, and 6. The circuit-changing spring Zis preferably mounted uponan insulating-support, at the upper end of which is disposed the normalcontactm and at the lower end of which is placed the contact-spring q,engaging one end of the armature-shaft forming a terminal of thegenerator-coil, which terminal is preferably thus connected with thenormal contact m. The armature-shell is formed in two sections r r,which may be rolled or pressed into shape, each section havinglongitudinal arcshaped portions r conforming to the space between thepoles of the generator, the curved longitudinal portions r beingconnected by a transverse fiat base portion r2, beyond both transverseed ges of which the arc-shaped portions r extend. ln assembling thearmaturecore the two flat base portions r2 are placed face to face, asshown most clearly in Fig. 4, and united by end plates s s, eachsupporting an individual shaft projecting outwardly from the armatureand supported in suitable bearings. The shaft thus does not extend allthe way through the armature, whereby we are enabled to provideincreased space for the armature-wire, thereby to increase theeffectiveness of the generator. The portions r2 being shorter than theportions r', suflicient space is afforded between the transverse edgesof said portions and the end plates s s for the disposition of thearmature-wire. Screws it are preferably employed for fastening theplates s s to the portions r of the armaturecore.

Changes may be made without departing from our invention, and we do not,therefore,

desire to be limited to the precise construction shown; but,

Having described our invention, we claim as new and desire to secure byLetters Patentl.A In a magneto-generator for telephone signaling, thecombination with an armature normally disconnected from thesignalingcircuit, of an electrically-,actuated signal-receiver connectedwith said signaling-circuit, a contact m, a coacting switch-spring Znormally engaging said contact and maintaining the signaling-circuitclosed, a driving-shaft passing through an opening in said switchspring,a second contact h mounted upon the said shaft, connected with thearmature-circuit, and automatic means for securing the longitudinalmovement of the shaft, whereby contact h' is moved to establishconnection with switch-spring Z and disengage the latter from contact m,substantially as described.

2. The combination inamagneto-generator, with an armature normallyincluded in a discontinuous circuit, of a bell cZ, anautomatically-operated circuit-changing switch-spring Z, a coactingcontact m normally engaged thereby to complete the bell-circuit, adriving-shaft having an enlargement h disposed in position forengagement with the said switchspring, but normally disconnectedtherefrom, said part h being connected with the armature-circuit, andautomatic means for effecting the longitudinal movement of the shaft andenlargement, whereby the latter is caused to engage and actuate theswitch-spring and connect the armature in series with the bellcircuit,substantially as described.

3. The combination with a manually-operated generator, of anautomatically-operated circuit-changing switch Z, the operating-shaft'of the generator passing through a bore of a IOO IIO

diameter larger than the diameter of the shaft, whereby the shaft isnormally maintained out of contact with said circuit-changing switch, anenlargement Zt upon the shaft normally maintained out of contact withthe switch, a normal contact m, a bell oZ included in series with saidnormal contact m and switch Z, one terminal of the generator beingconnected with the frame thereof and thereby with the operating-shaft,the other terminal of the generator being connected with the normalcontact, and means permitting of the longitudinal movement of the shaft,said generator and bell being located at one station and a suitablesignal-receiver at another station included in series with said bell andupon the operation of the generator with the bell andgenerator,substantially as described.

4. The combination with a manually-operated generator, of anautomatically-operated circuit-chan ging switch Z, the operating-shaftof the generator passing through a bore of a diameterlarger than thediameter ofthe shaft, whereby the shaft is normally maintained out ofcontact with said circuit changing switch, an enlargement h upon theshaft normally maintained out of contact with the switch, a' normalcontact m, a bell CZ included in series with said normal contact m andswitch Z, one terminal of the generator being connected with the framethereof and thereby with the operating-shaft, the other terminal of thegenerator being connected with the normal contact, means permitting ofthe longitudinal movement of the shaft, and cam mechanism for moving theshaft longitudinally upon its actuation, said generator and bell beinglocated at one station and a suitable signal-receiver at another stationincluded in series with said bell and upon the operation of thegenerator with the bell and generator, substantially as described.

5. In a magneto-generator,the combination with an armature formed of twoportions fr r each having longitudinal arc-shaped portions r r' and alongitudinally-shorter` base portion r2, a space being provided betweeneach transverse edge of the base portions and the ends of the portionsr', the base portions r2 r2 of the sections of the armature-core beingplaced together, of an armature Winding wound about the united baseportions r2, plates s secured to the portions r r and serving to unitethe parts r r, and individual separated shaftsections carried by saidend plates serving to afford a rotatable mounting for said armature, thearmature-winding be` ing interposed between and notinclosing saidshaft-sections, substantially as described.

In witness whereof we hereunto subscribe our names this 24th day ofApril, A. D. 1899.

ALFRED STROMBERG. ANDROV CARLSON. Witnesses:

GEORGE L. CRAGG, CHARLES E. HUBERT.

